Effects of light-trap design and illumination on samples of moths in an English woodland

1974 ◽  
Vol 63 (4) ◽  
pp. 583-594 ◽  
Author(s):  
L. R. Taylor ◽  
R. A. French
Keyword(s):  
Spatial Model ◽  
Light Trap ◽  
Mercury Vapour ◽  
Tungsten Filament ◽  
Trap Design ◽  
A Site

AbstractOperated in sheltered woodland, the samples obtained by Rothamsted tungsten-filament and Robinson mercury-vapour traps are best described by a spatial model different from that used in a site exposed to wind. Differences between the proportions of Noctuidae and Geometridae were accountable to differences in height of flight. The Rothamsted traps gave more consistent samples than the Robinson traps and averaged about onequarter the number of moths.

Trap design for monitoring moth biodiversity in tropical rainforests

1999 ◽  
Vol 89 (2) ◽  
pp. 153-163 ◽  
Author(s):  
J. Intachat ◽  
I.P. Woiwod
Keyword(s):  
Tropical Rainforest ◽  
Light Trap ◽  
Peninsular Malaysia ◽  
Tropical Rainforests ◽  
Mercury Vapour ◽  
Trap Design ◽  
Dipterocarp Forest ◽  
Tropical Conditions ◽  
Lowland Dipterocarp Forest ◽  
Experimental Comparisons

AbstractExperimental comparisons were made between samples of moths obtained by Rothamsted tungsten-filament and Robinson mercury-vapour light-traps operating in a lowland dipterocarp forest in Peninsular Malaysia. The Rothamsted trap gave more uniform and consistent samples and performed better in the tropical conditions than the Robinson trap. There were no significant differences between the overall measurement of diversity for the group Geometroidea between the two trap designs although the Robinson trap was much more erratic from night to night. The total catch of non-Geometroidea moths was remarkably similar in the two trap types. The choice of appropriate light-trap designs for biodiversity studies in tropical rainforest is discussed.

Effects of light-trap design and illumination of samples of moths in the Kenya highlands

1972 ◽  
Vol 62 (1) ◽  
pp. 91-112 ◽  
Author(s):  
L. R. Taylor ◽  
E. S. Brown
Keyword(s):  
Diversity Index ◽  
Light Trap ◽  
Three Dimensional ◽  
Mercury Vapour ◽  
Trap Design ◽  
Sample Distribution ◽  
Mercury Vapour Lamp ◽  
Representational Model ◽  
Definition Of ◽  
Size Interaction

The effect on the size of sample of 32 taxa of Macrolepidoptera, and on the index of diversity α, of various modifications of the light in Rothamsted and Muguga light-traps was investigated in experiments at Muguga, Kenya, in 1968. The sample of moths from the standard Muguga mercury-vapour trap was fifty times as big as that from the standard Rothamsted Tungsten trap. Using a mixed mercury-vapour and tungsten lamp in a Muguga trap halved the sample, as also would obscuring 60% of the light from a standard mercury-vapour lamp. Overall size of sample, direction of illumination and source of illumination all affected the proportion of different taxa in the sample, but the diversity index differed little in any of the combinations of traps, lamps and sites. Analysis of the pattern of sample distribution over the site showed that moths of all sizes were migrating downwind and height of flight was found to be positively correlated with size. Interaction between traps and sites, combined with the differing heights of flight of the different taxa, complicated the definition of specific sample size; a three-dimensional representational model attempts to define the spatial population parameters required to define the specific sample.

Seasonal population changes in cocoa capsids (Hemiptera, Miridae) in Ghana

1968 ◽  
Vol 58 (2) ◽  
pp. 279-294 ◽  
Author(s):  
D. G. Gibbs ◽  
A. D. Pickett ◽  
Dennis Leston
Keyword(s):  
Light Trap ◽  
West African ◽  
Mercury Vapour ◽  
Feeding Sites ◽  
Vegetative Tissues ◽  
Main Crop ◽  
Sahlbergella Singularis ◽  
Dry Conditions ◽  
Seasonal Population ◽  
Direct Counts

Pupulations of the West African cocoa capsids Distantiella theobroma (Dist.) and Sahlbergella singularis Hagl. were sampled in 1966–67 by several methods: fast knockdown over sheets with pyrethrum, mercury-vapour light-trap, direct counts in a small artificially established area of high population, and observations of presence or absence in randomly selected inspection squares.A population build-up in mature cocoa accompanies and probably directly depends on development of the main crop from July or August to October. When pods become scarce after harvesting there is in S. singilaris a period of dispersal in which the species becomes more widespread as feeding is transferred to vegetative tissues, and in D. theobroma a more local change of feeding sites.Subsequent events vary greatly between areas and between years. It is suggested that the extent to which capsids are able to utilise vegetative tissues varies and depends on nutritional changes in the external parenchymatous tissues from which their food is obtained.Low humidities during spells of harmattan in January and February almost certainly kill larvae in exposed situations, but feeding conditions following such periods may be particularly favourable to capsids as large rapid population increases can occur locally. The factors involved are obscure but may be related to processes of regeneration stimulated by leaf loss and other damage in dry conditions.The densities and seasonal patterns found are discussed in relation to results of previous workers and some implications for control briefly considered.

scholarly journals Do Different LED Colours Influence Sand Fly Collection by Light Trap in the Mediterranean?

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Gabriella Gaglio ◽  
Ettore Napoli ◽  
Francesca Arfuso ◽  
Jessica Maria Abbate ◽  
Salvatore Giannetto ◽  
...  
Keyword(s):  
Light Trap ◽  
Mediterranean Area ◽  
Sand Fly ◽  
Sand Flies ◽  
Light Traps ◽  
Trap Design ◽  
Phlebotomine Sand Flies ◽  
Positive Effects ◽  
Uv Led ◽  
The Mediterranean

Light traps represent the most used attractive system to collect and monitor phlebotomine sand flies. Recent studies have suggested that light traps can be easily upgraded by the use of light-emitting diode (LED) with positive effects on trap design, weight, and battery life. However, scant data on the effect of different LED colours on the attractiveness to phlebotomine sand fly species are available in literature. In this study, the capture performances of light traps equipped with different LED colours on phlebotomine sand fly species indigenous in the Mediterranean area were evaluated. Phlebotomine sand fly collections were performed using a classical light trap (CLT), equipped with a traditional incandescent lamp, and five Laika 4.0 light traps supplied, each with LED of different colours and wavelengths: (i) white; (ii) red; (iii) green; (iv) blue; (v) UV. Light traps were set for three consecutive nights fortnightly from May to October 2017 and climate data recorded using a meteorological station. A total of 411 phlebotomine sand flies (191 males and 220 females), belonging to three different species, namely, Phlebotomus perniciosus (n= 298, 141 males and 157 females), Sergentomyia minuta (n=110, 48 males and 62 females), and Phlebotomus neglectus (n=3, 2 males and 1 females) were collected. Abundance of capture was influenced by colours of LED and time. The highest number of phlebotomine sand flies was captured on June (P<0.01) and by UV LED (P<0.01). As regard to species, P. perniciosus was mainly captured by UV LED on June (P<0.01). No effect of time (P>0.05) or LED colour (P>0.05) was recorded for S. minuta and P. neglectus. According to the results of the present study light trap equipped with UV LED can represent an effective tool for the capture of sand fly species in the Mediterranean area.

The analysis and standardisation of light-trap catches of Heliothis armiger (Hübner) and H. punctiger Wallengren (Lepidoptera: Noctuidae)

1981 ◽  
Vol 71 (2) ◽  
pp. 207-225 ◽  
Author(s):  
R. Morton ◽  
L. D. Tuart ◽  
K. G. Wardhaugh
Keyword(s):  
Wind Speed ◽  
Light Trap ◽  
Adult Emergence ◽  
Wind Speeds ◽  
South Wales ◽  
Large Numbers ◽  
Successive Generations ◽  
Hourly Distribution ◽  
A Site ◽  
Trap Catches

AbstractHourly and nightly catches of Heliothis armiger (Hb.) and H. punctiger Wllgr. at a site adjacent to 2000 ha of commercial cotton in the Namoi Valley of New South Wales, were analysed in relation to various environmental factors and showed that wind speed, temperature, night-length and (H. armiger only) moonlight exerted a significant influence on trap-catch. For H. punctiger and H. armiger respectively, these factors accounted for 80 and 60% of the deviance in hourly catches but only 70 and 40% of the variation in nightly catches. Wind speeds of more than 1·7 m/s suppressed the catch of both species but had a greater effect on H. punctiger than H. armiger. Whereas with both species, the optimum temperature for trapping was about 27°C, temperature had a greater influence on the catch of H. punctiger than of H. armiger. Bright moonlight was estimated to reduce the catch of H. armiger by 49%, but no significant effect was detected for H. punctiger. The analysis revealed a number of occasions for both species in which the hourly distribution of catch and/or the change in catch between successive nights was aberrant. With H. armiger, these inconsistencies appeared to be associated with changes in population due to adult emergence, whereas for H. punctiger the most likely cause seemed to be changes due to movement. The combined effects of wind speed, temperature, night-length and moonlight were used to adjust the nightly catches of each species according to the environmental conditions prevailing on a ‘ standard’ night. This was defined as a typical summer's night with temperatures decreasing from 28·8°C at dusk to 20·6°C at dawn and ideal catching conditions, i.e. no moon and wind speed never exceeding 1·7 m/s. As such, the adjusted catches could be taken as indices of moth abundance. These showed that H. armiger had three discrete periods of abundance, characterised by the presence of large numbers of young moths and spaced at intervals suggesting successive generations. A similar pattern was lacking in H. punctiger, which was abundant only during the first half of the season. Except during periods of emergence (H.armiger), or once when spraying occured during daylight, the aerial application of insecticides to the cotton adjecent to the light-trap resulted in marked reductions in the populations of both species.

scholarly journals Observations on Philobota sp (Lepidoptera Oecophoridae) near Hamilton in 2012

2013 ◽  
Vol 66 ◽  
pp. 148-152
Author(s):  
P.J. Gerard
Keyword(s):  
New Zealand ◽  
Light Trap ◽  
Research Centre ◽  
Female Population ◽  
A Site

Two species of Philobota (Lepidoptera Oecophoridae) have been confirmed to be present in New Zealand These are P chionoptera found near Napier and Cape Kidnappers and an unnamed species ANIC5 belonging to the P hydara group found at Ruakura Research Centre Hamilton In spring 2012 a light trap confirmed the presence of a selfsustaining population of the latter at Ruakura Emergence commenced 1 October peaked on 30 October and the last moth was trapped on 3 December Prior to the peak males dominated the female population by 151 while after the peak the ratio was reduced to 141 Both mated and unmated females were collected and the maximum fecundity was 120 eggs The moth was confirmed at a site 2 km from the Research Centre A parasitoid Anacis sp (Ichneumonidae Cryptini) was collected in a cage containing Philobota sp ANIC5 pupae

A METHOD FOR SAMPLING LARVAL AND EMERGING INSECTS USING AN AQUATIC BLACK LIGHT TRAP

1971 ◽  
Vol 103 (10) ◽  
pp. 1365-1369 ◽  
Author(s):  
Donald Carlson
Keyword(s):  
Aquatic Insects ◽  
Light Trap ◽  
Trap Design ◽  
Black Light ◽  
Emerging Insects ◽  
Overall Effectiveness

AbstractA method is described for sampling aquatic insects using black light. Trap design, description of its placement, and conversion to a fumigator is explained. Total numbers of emerging insects captured by aquatic light trap are given and compared with catches in surface and bottom cone traps. Overall effectiveness of the black light trap is discussed.

A remote sensing method for the estimation of light-trap efficiency

1988 ◽  
Vol 78 (3) ◽  
pp. 379-385 ◽  
Author(s):  
W. J. McGeachie
Keyword(s):  
Remote Sensing ◽  
Insect Flight ◽  
Light Trap ◽  
Video Camera ◽  
Light Sensitivity ◽  
Trapping Efficiency ◽  
Mercury Vapour ◽  
Trap Catch ◽  
Preliminary Results ◽  
Trap Efficiency

AbstractA description is given of the use of a video camera to estimate light-trap efficiency in the field. This camera relies on the extra light sensitivity provided by the Newvicon detector tube to enable insect track discrimination. Recorded insect flight tracks were classified into three distinct categories, new arrivals, passers by and local flights, the numbers of which were compared to the moth catch in a Robinson mercury vapour light-trap. Calculations of efficiency were made using two methods, the best-estimate efficiency, obtained by comparing the new-arrival tracks to the light-trap catch, and the worst-estimate efficiency, obtained by comparing new-arrival tracks plus passer-by tracks to the light-trap catch. Preliminary results indicate that efficiency varies with windspeed but with a maximum of 39%, obtained in virtually calm conditions, suggesting that some aspect of moth behaviour limits trapping efficiency. It is suggested that the speed of migration of screening pigment from the dark-adapted state to the light-adapted state in superposition eyes may have a bearing on the catching mechanism of a light-trap.

An automated modular light-trap design

1996 ◽  
Vol 19 (1) ◽  
pp. 81-85 ◽  
Author(s):  
E. G. White
Keyword(s):  
Light Trap ◽  
Trap Design
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